this compact dive computer Descent G1 from garmin

Support for multiple dive modes - ranging from technical to free dives.
GPS enabled to help mark surface entry and exit points.
Store up to 200 dives. Upload, share and review dives in the Garmin Dive™ app1.
Measure your performance, and track your stats above water.
Track your activities with more than 30 built-in sports apps and advanced training features.
Explore longer with up to 25 hours in dive mode, 21 days in smartwatch mode and 26 hours in GPS mode.